Cap die



All@ 24, 1948.V c'. w. GoonwlN ET AL 2,447,855

CAP DIE Filed Oct. 29, 1946 v 4 Sheets-Sheet 1 INVENTORS. C. W 6'0@dwz/7 ATTORNEY.

All@ 24, 1948. c. w. GoDwlN ET AL 2,447,855

CAP DIE y Filed Oct. 29, 1946 4 Sheets-Sheet 2 INVENTORS C. W Good w01BY 9 /f' WATTORNEY.

Aug. 24, 1948. 1 c.' w; GOODWIN ETAL 2,447,855

CAP DIE Filed oct. 29, 194e 4 Sheets-sheet s A? w w@ Aug. 24, 1948. c.w. GOODWIN ET AL. 2,447,855

CAP DIE Filed oct. 29, 194e 4 sheets-sheet 4 ATTORNEY.

Patented Aug. 24, 1948 UNITED STATES PATENT OFFICE i. GAP DIE Carl WLGoodwin', Planeld, N. J., and Kenneth R. Allen, Ridgewood, N. Y.,assignors to American Seal-Kap Corporation of Delaware, Wilmington,Del., a corporation of *Delaware Application October 29, 1946, SerialNo. 706,318

(Cl. .9S- 1.3)

1% Claims. 1

This invention relates to dies for making paper bottle caps of thetypeghaving a central depressed diaphragm to seat on the internal ledgeof a milk bottle or the like and a peripheral U-shaped housing to coverthe pouring rim of the bottle.

An object of the invention is to provide a die of the above type havingnovel andimproved' details of construction and features of operation.

A more specic object is to provide a `die of the above type rin whichair pressure is used for imparting the final forming pressure to thecap.

Anotiher object is to provide a die of the above type which is adaptedto o-perate in the commercial lproduction of caps for long periods oftime without repairs or adjustments.

Various other objects and advantages will be apparent as the nature ofthe invention is more fully disclosed.

Although the novelfeatures which are believed to be `characteristic ofthis invention are pointed out more particularly in the claims appendedhereto, the nature of the invention will bebetter understood byreferring to the following description taken in connection with theaccompanying drawings in which a specific embodiment thereof has beenIset forth for purposes of illustration.

In the drawings:

' Fig. 1 is a side elevation of the upper die showing the supporting ramin section;

Fig. 2 is a side elevation of the lower die showing the supporting baseplate in section;

3 is a longitudinal section through the upper die on an enlarged scaletaken on the line 3-3-of Fig15;

Fig. 4 is a -longitudinal section through the lower'die on an enlargedscale taken on the line 4-4'of`liig. 6;

Fig. 5 is a transverse section through the upper die taken on the line5-5 of Fig. 3;

` Fig. 6 is a transverse section through the lower die taken on the line6-3 of Fig. 4;

Fig. '7 is a broken perspective viewillustrating a cap of the type whichis formed bythe dies of the present invention; and

Figs. 8, 9,` and 11 are partial verticalr sections through thecooperating portions "of the upper and lower dies showing successive'stages in the cap-forming operation.

The die in accordance with the present invention is adapted to form apaper cap of the type shown in Fig. 7 which comprises a centraldepressedfdiaphragm I0 which is adapted to seat on the internal ledge ofa milk bottle or ldh'e like, and pouring lip housing `I2 which isadaptedto extend over the pouring lip of the bottlef" The housing I2comprises an inner vertical wall I3, a top wallA I4, and an outer skirtI5. The top'wall i4 is provided with raised beads or corrugations i6which extend radially thereacross.' A capof this general type isdisclosed more in detailV in MartinPatent No. 2,221,197 `dated November12, 1940.

Referring to Figs. 1 and 2 an upper die 20 is shown as secured bysuitable means in aram 2I which forms a part of `'dheforrriing pressandis adapted to be reo'iprocated vertically.

A lower die 3U is held in a sleeve 3l which is secured in a base plate32 forming a party of the base of thepress 'The lower dieS is providedwith a cap 33 which is'adjustablyv secured'to a base 32 whichconstitutes the bed of the press, by means vof a bolt 34, bracket 35 andboltsi3I which are threaded into" the base 32. The bolt 34 'is `providedwith a spherical pressure fsurface 3l which equalizes the thrust uponthe bolts- 36.

The upper-die 20, as `shown in Figs. Sand 5, comprises a shell '40having a ca`p4I which is secured thereto and is properly aligned by pins42 having surfaces 43 wihich enter bores 44`in the shell'i. l"The shell40' and' shell cap 4Iform a cylinder 45'to which air under pressure issupplied through a port 45.

The' shelli carries a cylinder liner-4`ll (Figs.

f 8 to 11) in which a piston'48 slides. The piston 48 is preferablyprovided with 'oil grooves 49 and is sealedat the top by a `Cup packing50l of suitable packing material such as rubber or leather and acompressible packing disc 5I `preferably of rubber which is secured andclamped by a pover plate `52 and a center screw 53. Lubrication isprovided-by wicking54 which extends downwardly from the packing 50` andcommunicates withA anI oil groove 55.

The lower end of'the piston "48 is sealed'by suitable packing material58 which is compressed in a packing' glandwby a cap'EB and a clampingbolt lill.

Anv upper diaphragm 'body cap (i5 is slidably mounted-in' the-liner41'below'the piston 48- and is pressure sealed to? the cylinder liner bymeans of a cup-packing GS held against'the upper'diaphra'gm body Icap 65by means'of a pressure'plate El and a'central screWGB. 'llhe plate `61rests against an annular flangeBS formed-on the'lower piston cap 59.

The diaphragm bodyv cap is pinned to a diaphragn'il body 1U by means ofpins-1I. The diaphragm body" 10 carries a diaphragm head 'I2 having aplurality of 4radially projecting'ns i13 provided with bottom surfaces14 which are adapted to register with the corrugations on the top of thepouring lip housing I2 of the cap, and with an annular flange 15 havinga lower surface 16 which forms the outer peripheral portion of the capdiaphragm I0. The head 12 is secured to body 10 by any suitable meanssuch as pins 12a (Fig. 3).

A diaphragm plunger 80, having a lower surface 8| adapted to form thecentral portion ofY the cap diaphragm, is provided with a sleeve 82,4

"sgary pressure for holding the cup |3I in its upper position against ashoulder |43 formed in the which slides in a suitable chamber 84 in thef5 The'shell I 38 carries a skirt sizing ring |50 hav- 1 .ing-.atopsurface I5| which is adapted to size and diaphragm body and carries acap 83 lwhich bears against a shoulder 85 of the body 10 to Vlimit thedownward movement of the' diaphragm plunger 80. A spring 9| is seatedwithin the chamber 84 of the diaphragm body 10 and bears against the cap83 to press the diaphragm plunger 80 downwardly. An ejector pin 80 isslidably mounted in a bore in the diaphragm plunger 80 and isspring-pressed downwardly by means of a spring 89 which is seatedagainst a shoulder 90 of the ejector pin and against the Icap 03.

An upper corrugation ring 95 is positioned around the diaphragm body 10and is secured to the shell 40 by means of set screws 96. Thecorrugation ring 95 is provided with a plurality of vertical slots |0|which register with and are adapted to receive the fins 13 of thediaphragm head 12. A key 91 attached to the top of the corrugation ring95 by a screw 98 rides in a slot 99 in the diaphragm body 10 foraligning the slots I0| with the fins 13. The lower surface |02 of thecorrugation ring is adapted to engage and form the top surface I4 of thepouring lip housing of the-cap between the corrugations I8. A ring ofsoft material such as felt |04 surrounds the diaphragm body 10 andengages the corrugation ring 95 to clean the surface thereof and preventany oil from dripping downwardly onto the cap being die-formed.

A skiving ring I I0, having a surface I I to form the outer skirt I5 ofthe cap, is held in a creasing ring II2 by means of a retaining ring |I3which is locked by a set screw II 8.

The creasing ring ||2 is provided with a iluted lower surface ||4 .whichis adapted to crease the outer portion of the cap blank to facilitatethe folding thereof downwardly to form the skirt I5. The creasing ring||2 is mounted on pins II5 which are positioned in the recesses 44 ofthe shell 40 and are held downwardly by springs ||6 which are seatedbetween the top of the pins II5 and the pins 42 above mentioned. Thepins I I5 are provided with shoulders I |1whichlimitthe downwardmovement of the creasing ring H2. Studs |20, secured from the bottom ofthe shell 40, bear against the top of the creasing ring ||2 for limitingthe upward movement thereof and exerting the creasing and skivingpressures.

The port 46 is connected by means of a supply pipe I2| to a suitablesource of fluid vunder pressure such as a compressed air tank not shown.

Referring to Figs. 4 and 6, the lowerdie comprises a shell having acylinder in which a cup |3| is slidably mounted. The shell |30 carries alower cap |32 which is secured thereto by screws |33 and is providedwith an annular ange |34 which extends within the cup |3|. A head |35 islikewise mounted within the :cup |3| and is provided with a top flange|36 between which and the flange |34 suitable compressible packingmaterial |3111 is positioned. The head |35 is secured by a nut |36 whichbears against the end of a sleeve |31 forming a part of the cap |32 andserves to shell |30.

`shape'the bottom of the cap skirt I5. The sizing ring |50 is clamped tothe shell |30 by means of A draw ring sleeve |60 is mounted to slidewithin thesizing ring |50 and at its lower end rests upon the uppersurface of the cup I3I. A key ISI, secured by a screw I 53, enters arecess I 62 in the drawring sleeve for holding the latter in properalignmentand` for limiting the movement of the sleeve when the cup I3Iis removed for the purf' pose-of assembly. A draw ring |64 slides withinthe sleeve |60 and is provided with a top surface |65 which is' adaptedto enter and shape the lower surface of the-top I4 .of the pouring liphousing I2 ofrthe cap.-- I f The draw ring |64 is provided with a lowerflared surface IE6-which engages a corresponding vsur-face AY|61 of thedraw ring sleeve |60 for limiting the downward movement of the draw ring|64;= The draw ring |64 is pressed upwardly by a plurality of pins lI 68mounted in recesses formed partly in the draw ring sleeve |60 and partlyina diaphragm draw block |10 which is mounted to slide within the drawring |64. Springs |69 insaid recesses bear against the pins |60 forurgingthe same upwardly; A stud |1I, carried by the draw ring |64 slidesin a recess |12 in the draw-ring sleeve |60 for limiting the upwardmovementjof the ldraw ring I 64. The diaphragm draw block |10 isprovided with anluppersurface |15 which is adapted to formthe--under-surface of the cap diaphragm I0 and is held upwardly by meansof a spring |16 which is seated within a recess |11 of said draw blockand seatson a cap |18 which rests upon the top surface of the cup I3I.The cap |18 is secured to the draw ring sleeve |60 .by means of aretaining ring |19.

A lower creasing ring |80, having a fiuted upper surface |8| adapted tocrease the outer portion of the blank, is mounted on pins I 82 havingheads |83 which slide in recesses |84 in the shell |30 and are heldupwardly by springs I 85. The heads |83 limit the upward movement ofthecreasing ring |80.

It is to be noted that the area of the top of the cup I 3| which isexposed to the air pressure within the cylinder-|42 is greater than thearea of the top of the piston 48 which is exposed to the air pressurewithin the cylinder 45. Hence more force is required to depress the cup|3| against thisair pressure than is required to raise the piston 48.`

The successive steps in the formation of a cap will be better understoodby referring to the successive positions shown in Figs. 3 and 4 and inFigs. 8, 9, 10 and 11, respectively. Figs. 3 and. 4 show the normalpositions of the Various die parts before the start of the formingoperation. It will be understood that the cap blank in the form offaflat disc is placed across the top of the lower alza-asas die `showninFig. 4 and restsiuponltheadiaphragm draw blockl il -the draw ringil641v and. .the creasing rin-g" 80.

1 As'v -therarn 2 If o'fy lig. i1.' brings .theupperrnie downwardlyagainst -theefcap '=blank'-. the ejector? pin 88 is first retractedlinto the uppersdiaphragm plunge'rf .80."1The 'upperfdiaphragm fplungerv80 isL then "retracted into" th diaphragmheadi -12 against the lforce'oi- -the spring SLFJIheLIairpr-espiston 48 in its downward positionsthroughout this' stage of the'operationg' The "diaphragm plunger 80 andVdiaphragm'-head. flange' 15a-'fare then forced' downwardly within 4the'draw'ring J I 64 depressing Athefdiaphragr'n draw block |10l againstthe force of -thespring "|165"v The upperfcr'easing ring' 2| |-2=alsoystrikes ythe-blank against. the lower creasing ring "1.80. tovl'crease' -theJ-.Jouter marginal portion oi thebl'ank' Z'llr'e'dies larethenin the position shown in Fig. 8.. V Continued' downwardl mover-nento iffthe .ram causes theris 13 of thedi'aphragm head 1.2 to push thepaper ofthe cap downwardly against-the lowerfdravvringr 64 andfthrebyretract theflower draw ring" 54' 'against-.fthe fdraw Vring `sleeve |50.The-draw block I 10 seats-upon vthe `cap |18 and thev pressure on thefdiaphragm plunger! 80xand diaphragm head 12 has lz cau'sed thefpistoni48 to start "retracting' against' the air' .pressurein the cylinder- 45as shown in-Fi'g. 9.

yContinued downward-.vmovem'ent ofethe ram from vthe position' f ffFig.9.'causes the "piston 4B to be -iurther'retracted against the-'airpressure Within thecylinde'r |15` until tlie''ns 13 of thediaphragm-'head 12 enter. the slots |0I ofl the cor; rugation-ring95^and engage-against theH body of the corr-ligation ring.- 'At theSametime the studs I20 of the shell 40 engage the top `of the creasingring ||2` arid force the-creasingring v`'| l2 andskivingring |'0downwardly to fold and skivethe `outer portion of the` capV skirt I5a's-fshown inliig. 10'.' -The parts of the upper fdie fare now locked bythe corrugation' ring 95 again'stfurther movement relative to the 'shell40Y and-continued downward movement of the ram and shell serves todepress the `dravv ringsleeve |60 and the draw block |10against-theforce of :thel air pressure within the cylinder |42 asindicated in Fig. 11 until theskirt of the -cupv `|3| hitsand 'becomesrigid with the cap |32 of the lower-die'. A-Inasrnuch as the skiving"ring |50 is carried rigidly by the shell |30 the skiving ring is notdepressed and accordingly serves to compact and form the'bottom ofthe-cap skirt |5- and to press the'capmaterial upwardlyinto the-'spacesinthe slots |0| of the corrugation ring 95 below the ns 13, for compactingand forming the corrugations I6 of the cap. This constitutes the finalforming operation.

When the ram is retracted the die parts return in the reverse order. Theupward movement of the draw ring |64 with respect to the draw ringsleeve |60 serves to strip the cap skirt from the draw ring sleeve andallows the same to be readily removed from the lower die. The successiveactions of the diaphragm plunger 80 and of the ejector pins 80 serve tostrip the cap from the upper die and allow the same to rest between thetwo dies from which position it is removed by a dial plate not shown.

The use of air pressure in the cylinders 45 and |42 permits highoperating pressures to be built up without acquiring the use of largesprings which, in addition to complicating the apparatus, tend to breakafter a limited amount of use.

At thetsametime the 'difterential pressure. exerted on lthe pistonzandthe .cup -|3| due tothe difierence's inrsiz'e` between4 the.. effective:surfaces thereof nprovideszior: the: proper .operating sequence of theparts.

Although a .specifictiembodiment oi` the: invention has been shown it isto be understood thatnthe'ifinvention is .Y capable of various usesandithat changes-,.andf adaptations vmay. be made thereinas.will,ben.readily apparent to a .person skilledf inthefartp Thevinvention is only to be restricted ini aaccordancef withxthe .followingclaims.

What is claimed is:

1i. Andie .for forming' paper caps: orthe like having a 'centralfdepressed vdiaphragm portion anda peripheral inverted container rimhousing, said 'die comprisingr upper and'lower die members mounted diortrelativ'e forming and returnmovements and'including upper-.and lowerdiaphragm formingv members, ,conforming tothe depressed capi diaphragm,a' lowerV draw 'ring conforming to the inside surface of the peripheralrim housing;N andzzani:upper` pressure ring conforming to theatopfawall' of said'frim housing; said upper and lower :diefmemberseachhaving a shell forming at.fcompressedu'airl cylinder; `pistons insaid cylinders" toYV :moveevertically': against the airpressureltherein, means -mounting vsaid upper rdiaphragm: forming membertov vmove with said upper :pistorLfmeans -mounting said upper pressurering to move'with: said .upper "die shell, vmeans mountingysaid-flowercdiaphragm forming member and :sai-d lower drawring to movewith said lower@die-piston:r at-xleast inthe final forming stage, saidupper. apiston' having-.an effective area lessithan that of4 said lowerpiston whereby the upper diaphragm forming'memberrst cups the blankv to.formi @the` depressed cap diaphragm and isvv then=retracted against theair pressure in the upper shell cylinder-While the'upper shell feedstheupper pressurefring against, the cap blank, and the lower diaphragmforming memberand lower `drawl ring'fare then retracted against theair-1' pressure irrfthelovver shell cylinder by the pressure ofthe'upper pressure ring in the final formingrstage. l 2. Audie` asset-forth in claim 1 in which said lower-.pistoncomprisesian invertedcup having a'dependin'g vskirt sliding in said lower shell cylinderanda` xedhead attached to said shell closes the flower end of 'saidcylinder,- `said head having an airduct to supply :compressed air tosaidv cylindex'.

3. A/'dief as vsetviorth in claim v1 in which `said lower-pistoncomprises an inverted cup having a depending skirt sliding in said lowershell cylinder and a fixed head attached to said shell closes the lowerend of said cylinder, said head having an air duct to supply compressedair to said cylinder and packing means carried by said head to sealagainst the inner wall of said depending piston skirt.

4. A die as set forth in claim 1 in which said lower diaphragm formingmember is spring mounted on said lower piston to be retracted inresponse to pressure exerted by said upper diaphragm forming member forcupping and drawing the cap diaphragm prior to retraction of said lowerpiston against the air pressure in the lower shell cylinder due to thepressure applied to the blank by said upper pressure ring.

5. A die as set forth in claim 1 in which said upper diaphragm formingmember comprises a 5 head rigidly mounted with said upper piston to formthe inner vertical wall and atleasta portion ofthe top wall of the rimhousing of .the cap, and a central diaphragm plunger slidably mounted insaid head and spring pressed downwardly to engage the cap blank and' tobe retracted into said head prior to the cupping operation.

6. A die as set forth in claim 1 in which the upper piston carriespacking to'form a pressure seal with said upper cylinder and said upperdiaphragm forming .member is provided with a head slidable in said uppercylinder and engaging the lower end of said upper piston rto be actuatedtherewith.

7. A die as set forth in claim l in which the upper piston carriespacking to form a pressure seal with said upper cylinder and said upperdiaphragm forming member is provided with a head slidable in said uppercylinder and engaging the lower end of said upper piston to be actuatedtherewith, said head also having packing means forming a pressure sealwith said upper cylinder.

8.' A die for forming paper caps or the like having a central depresseddiaphragm portion and a peripheral inverted U-shaped container rimhousing having an`inner vertical wall; a top wall and an outer dependingskirt,` said die comprising upper and lower die members mounted forrelative forming and return movements and including upper and lowerdiaphragm forming members conforming to the depressed cap diaphragm, alower draw ring conforming to the inside surface of the peripheral rimhousing, an upper pressure ring conforming to the top wall of said rimhousing, an upper skiving ring conforming to the outer surface of thecap skirt for skiving and forming'the same, a lower sizing ring adaptedto extend between said skiving ring and said draw ring to exertdie-forming pressure on the lower edge of the cap skirt, said upper .andlower die members each having a shell forming a compressed air cylinder,pistons in said cylinders to move vertically against the air pressuretherein, means mounting said upper diaphragm forming member to move withsaid upper die piston, means mounting said upper lpressure ring and saidskiving ring to move with said upper die shell at least in the'iinalforming stage, spring means mounting said lower' diaphragm formingmember to move with said lower die piston at least in the final formingstage, means mounting said lower draw ring on said lower piston, andmeans mounting said sizing ring on said lower die shell, said upperpiston lhaving an effective area less than that of said flower pistonwhereby' the upper diaphragm forming member rst cups theblankto form thedepressed cap diaphragm and is then retracted against the air pressurein theupper shell cylinder whilethe upper shell actuates the upperpressure ring and the skiving ring, and the lower diaphragm formingmember is depressed against its spring mounting to cup the blank priorto retraction ofthe lower draw ring against the'` air pressure in thelower shell cylinder in the'lnal skirt sizing stage.

9. A die as set forth in lclaim 8 in which saidlower piston comprises aninverted cup havingv a depending skirt sliding in said lower shellcylinder and axed head attached to said shell closes the lower end ofsaid cylinder, said head having an air duct to supply 'compressed air tosaid cylinder'and packing means carried by said head to seal against theinner wall of said depending piston skirt.

10. A die as set forth in claim 8 in which said upper diaphragm formingmember comprises a head rigidly mounted with said upper piston to form'the' inner vertical wall and at least a portion of the top wall of therim housing ofthe cap, and a central diaphragm plunger slidably mountedin said head and spring pressed downwardly to engage the cap blank andbe retracted into said head prior to the cupping operation.

11. A die as set forth in claim 8 in which the upper piston carriespacking to forml apressure seal with said upper cylinder-and said upperdiaphragm forming member is provided with-a head slidable in said uppercylinder and engaging the lower end of said upper piston to be yactuatedtherewith, said head also having packing means forming a pressure sealwith said upper cylinder. l

12. A die as set forth in claim 1 in which the lower draw ring comprisesan outer sleeve and a. head slidable therein, said liead lconforming tothe inner and top walls of the cap rim housing and being spring pressedupwardly to stripthe cap skirt from said-sleeve. v

, CARL W. GOODWIN.

KENNETH R.- ALLEN.

REFERENCES CITED The following references are of record in the le ofthis patent:

y UNITED STATES PATENTS Number l Name Date 2,250,450 Faber July 29, 19412,325,161 l Goodwin et al July 27, 1943

